/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QBasicTimer>
#include <QList>
#include <QImage>
#include <QDir>
#include <QPainter>
#include <QPaintEvent>

#include <QDebug>


#include "slideshow.h"


class SlideShowPrivate
{
public:
    SlideShowPrivate();

    int currentSlide;
    int slideInterval;
    QBasicTimer interSlideTimer;
    QStringList imagePaths;

    void showNextSlide();
};



SlideShowPrivate::SlideShowPrivate()
{
    currentSlide = 0;
    slideInterval = 10000; // Default to 10 sec interval
}


void SlideShowPrivate::showNextSlide()
{
    currentSlide++;
    if (currentSlide >= imagePaths.size())
      currentSlide = 0;
}



SlideShow::SlideShow(QWidget* parent) :
    QWidget(parent)
{
    d = new SlideShowPrivate;

    setAttribute(Qt::WA_StaticContents, true);
    setAttribute(Qt::WA_OpaquePaintEvent, true);
    setAttribute(Qt::WA_NoSystemBackground, true);

    setMouseTracking(true);
}


SlideShow::~SlideShow()
{
    delete d;
}


void SlideShow::addImageDir(QString dirName)
{
    QDir dir(dirName);

    // lookup in directories
    QStringList fileNames = dir.entryList(QDir::Files | QDir::Readable, QDir::Name);
    for (int i=0; i<fileNames.count(); i++)
        d->imagePaths << dir.absoluteFilePath(fileNames[i]);

    // lookup in qrc
    dir = QDir(QString(":/fluidlauncher/" + dirName));
    fileNames = dir.entryList(QDir::Files | QDir::Readable, QDir::Name);
    for (int i=0; i<fileNames.count(); i++)
        d->imagePaths << dir.absoluteFilePath(fileNames[i]);
}

void SlideShow::addImage(QString filename)
{
    d->imagePaths << filename;
}


void SlideShow::clearImages()
{
    d->imagePaths.clear();
}


void SlideShow::startShow()
{
    d->interSlideTimer.start(d->slideInterval, this);
    d->showNextSlide();
    update();
}


void SlideShow::stopShow()
{
    d->interSlideTimer.stop();
}


int SlideShow::slideInterval()
{
    return d->slideInterval;
}

void SlideShow::setSlideInterval(int val)
{
    d->slideInterval = val;
}


void SlideShow::timerEvent(QTimerEvent* event)
{
    Q_UNUSED(event);
    d->showNextSlide();
    update();
}


void SlideShow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, false);

    if (d->imagePaths.size() > 0) {
        QPixmap slide = QPixmap(d->imagePaths[d->currentSlide]);
        QSize slideSize = slide.size();
        QSize scaledSize = QSize(qMin(slideSize.width(), size().width()),
            qMin(slideSize.height(), size().height()));
        if (slideSize != scaledSize)
            slide = slide.scaled(scaledSize, Qt::KeepAspectRatio);

        QRect pixmapRect(qMax( (size().width() - slide.width())/2, 0),
                         qMax( (size().height() - slide.height())/2, 0),
                         slide.width(),
                         slide.height());

        if (pixmapRect.top() > 0) {
            // Fill in top & bottom rectangles:
            painter.fillRect(0, 0, size().width(), pixmapRect.top(), Qt::black);
            painter.fillRect(0, pixmapRect.bottom(), size().width(), size().height(), Qt::black);
        }

        if (pixmapRect.left() > 0) {
            // Fill in left & right rectangles:
            painter.fillRect(0, 0, pixmapRect.left(), size().height(), Qt::black);
            painter.fillRect(pixmapRect.right(), 0, size().width(), size().height(), Qt::black);
        }

        painter.drawPixmap(pixmapRect, slide);

    } else
        painter.fillRect(event->rect(), Qt::black);
}


void SlideShow::keyPressEvent(QKeyEvent* event)
{
    Q_UNUSED(event);
    emit inputReceived();
}


void SlideShow::mouseMoveEvent(QMouseEvent* event)
{
    Q_UNUSED(event);
    emit inputReceived();
}


void SlideShow::mousePressEvent(QMouseEvent* event)
{
    Q_UNUSED(event);
    emit inputReceived();
}


void SlideShow::mouseReleaseEvent(QMouseEvent* event)
{
    Q_UNUSED(event);
    emit inputReceived();
}


void SlideShow::showEvent(QShowEvent * event )
{
    Q_UNUSED(event);
#ifndef QT_NO_CURSOR
    setCursor(Qt::BlankCursor);
#endif
}